Every object in Java code has one lock, which is useful for ensuring that only one thread accesses critical code in the object at a time. This synchronization helps prevent the object's state from getting corrupted.
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Thread synchronization
Every object in Java code has one lock, which is useful for ensuring that only one thread accesses critical code in the object at a time. This synchronization helps prevent the object's state from getting corrupted. If a thread has obtained the lock, no other thread can enter the synchronized code until the lock is released. When the thread holding the lock exits the synchronized code, the lock is released. Now another thread can get the object's lock and execute the synchronized code. If a thread tries to get the lock of an object when another thread has the lock, the thread goes into a blocked state until the lock is released.
Synchronized
You can use the synchronized keyword to declare a method as synchronized. This method cannot be accessed by multiple threads simultaneously. The synchronized keyword can also be used to mark a block of code as synchronized. For this, the argument passed should be the object whose lock you want to synchronize on.
When the wait() method is invoked, a thread releases the lock on an object and moves from the running state to the waiting state. The notify() method is used to signal one of the threads waiting on the object to return to the runnable state. It is not possible to specify which of the waiting threads should be made runnable. The notifyAll() method causes all the waiting threads for an object to return to the runnable state.
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